Area of regions in the plane
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0. Introduction:The history of area
1. Regions in the plane
2. Classifying quadrilaterals
3. The meaning of area: why we need formulas
4. Area of rectangles, parallelograms and triangles
5. Area of trapezoids
6. Area of general polygons by cutting the plane
7. Area of general polygons by Green's Theorem
8. Area under a curve